Process for preventing electrostatic charges on synthetic high polymers



United States Patent 3,055,110 PROCESE FGR PREVENTING ELECTRQTATCCHARGES 0N SYNTHETIC HIGH POLYMERS Waiter Hagge, Leverkusen, HeinrichKrause, Kola- Starnmheirn, Matthieu Quaedviieg, Leverl-nisen, AntonSchlachter, Lochham, and Karl Schiinoi, Leverlrusen, Germany, assignorsto Farbenfabriken hayer Alrtiengesellschaft, Leverhusen, Germany, acorporation of Germany No Drawing. Filed Nov. 8, 1960, Ser. No. 67,392Qlairns priority, application Germany Nov. 24, 1959 4- Claims. (61.117--=138.8)

The present invention relates to the prevention of electrostatic chargeson synthetic high polymers; more particularly it concerns a process forpreventing electrostatic charges on synthetic high polymers whichconsists in treating the synthetic high polymers with salts having thegeneral formula wherein R denotes an alkyl residue containing at least10 carbon atoms, R and R are hydrogen and/ or the same or differentalkyl or aryl residues, R is an aliphatic or aromatic residue, and R Ras well as R are the same or different alkyl, hydroxyalkyl, or aralkylresidues, whereas X is an acid residue.

The salts to be used in accordance with the invention are obtainable byvarious methods, e. g. according to British patent specification No.500,153 in that aliphatic isocyanates containing at least 10 carbonatoms in the alkyl residue, e.g., dodecyl isocyanate, tetradecylisocyanate, and octadecyl isocyanate, are reacted with bivalentaliphatic or aromatic amines which contain a primary or secondary aminogroup and a tertiary amino groupe.g. with3-dimethylamino-l-arninopropane or p-aminodimethyl aniline-and thereaction product is treated with a quaternizing agent, tag. withdimethyl sulfate, diethyl sulfate, benzyl chloride, or Z-bromoethanol.

The treatment of the synthetic high polymers, e.g. fibres, filaments, orpowders from polyamides, polyesters, polyacrylonitriles, or polyvinylchlorides, with the salts of the general formula indicated above iscarried out in a manner known as such, e.g. by spraying or impregnatingthe materials to be treated with solutions of the salts in water ororganic solvents.

The salts of the present invention distinguish themselves frompreviously known agents which have already been proposed for theprevention of electrostatic charges on synthetic high polymers by asurprisingly higher effect.

The following examples serve to illustrate the invention without,however, limiting the scope thereof.

Example 1 A fabric of polyacrylonitrile threads is treated at 403,0fi5,ll0 i atented Nov. 20, 1&32

C. at a goods-to-liquor ratio of 1:30 with an aqueous solution whichcontains, per litre, 0.02 g. of N-tetradecyl-N'-(3-dimethylamino)-propylurea quaternized with dimethyl sulfate. Thefabric is then centrifuged and dried. The surface resistance of thefabric at relative air humidity has then decreased from 4X10 S2 to 1x100.

Example 2 A fabric of polyester fibres is treated, as described inExample 1, with a solution which contains, per litre, 0.03 g. ofN-octadecy1-N'-(3-dimethylarnino)-propylurea quaternized with dimethylsulfate. The surface resistance of the fabric at 65% relative airhumidity has then decreased from 2 l0 S2 to 5X10 9.

Example 3 A fabric of polyvinyl chloride is treated, as described inExample 1, with a solution which contains, per litre, 0.05 g. ofN-octadecyl-N'-(3-dimethylamino)-propylurea quaternized with2-brornethanol. The surface resistance of the fabric at 65% relative airhumidity has then decreased from 5.10 S2 to 3.10 9.

We claim:

1. A process for inhibiting the formation of electrostatic charges onsynthetic high polymers comprising treating a synthetic high polymerwith a salt having the general wherein R denotes an aliphatic residuecontaining 12-18 carbon atoms, 1R and R are H atoms, R, is

References Cited in the file of this patent UNITED STATES PATENTS GruberJuly 28, 1959 FOREIGN PATENTS Great Britain Feb. 3, 1939

1. A PROCESS FOR INHIBITING THE FORMATION OF ELECTROSTATIC CHARGES ONSYNTHETIC HIGH POLYMERS COMPRISING TREATING A SYNTHETIC HIGH POLYMERWITH A SALT HAVING THE GENERAL FORMULA